tooth cup

牙齒是存在於很多脊椎動物的頜部內、用於咀嚼食物的鈣化組織。肉食性動物尤其倚賴牙齒進行獵食或搏鬥、禦敵。牙齒的構成成份不是骨骼，而是由動物體內不同密度與硬度的複雜組織組成，它的根部則由牙齦包覆、固定。

Teeth are present in the jaws of many vertebrates, for chewing food calcified tissue. Carnivorous animals, particularly predators rely teeth or fight, to resist the enemy. Teeth constituent components are not bones, but by animals of different density and hardness of complex organizations, its roots covered by gums, fixed.